the california breast cancer mapping project found portions of san mateo, santa clara and alameda counties had breast cancer rates that were 10% to 20% higher than the state average from 2000 to 2008. these higher-than-average rates were also found in slices of sonoma, napa and solano counties. however, the study does not list a cause for these rates, but it's long been known breast cancer risk factors include everything from drinking alcohol daily to taking certain hormone replacements. and this behavior tends to be common among higher income women, which, of course, the bay area does have. still, the study does not say this correlation is in fact the cause of the higher breast cancer rates that we're seeing in the study. so if you're a woman living in the bay area, what do you make of the study? first of all, don't forget breast cancer can be genetic and doctors also worry about certain environmental factors. more reasons for us women to practice good breast care and that includes staying current on our mammograms. jon. >> thank you very much. very important information there. >>> 6:08.